Class: Tui::Line

Inherits:
Object
  • Object
show all
Defined in:
lib/tui.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(screen, background:, truncate: true) ⇒ Line

Returns a new instance of Line.



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# File 'lib/tui.rb', line 489

def initialize(screen, background:, truncate: true)
  @screen = screen
  @background = background
  @truncate = truncate
  @left = SegmentWriter.new(z_index: 1)
  @center = nil  # Lazy - only created when accessed (z_index: 2, renders on top)
  @right = nil   # Lazy - only created when accessed (z_index: 0)
  @has_input = false
  @input_prefix_width = 0
end

Instance Attribute Details

#background ⇒ Object

Returns the value of attribute background.



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# File 'lib/tui.rb', line 487

def background
  @background
end

#truncate ⇒ Object

Returns the value of attribute truncate.



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# File 'lib/tui.rb', line 487

def truncate
  @truncate
end

Instance Method Details

#center ⇒ Object 



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# File 'lib/tui.rb', line 508

def center
  @center ||= SegmentWriter.new(z_index: 2)
end

#cursor_column(input_field, width) ⇒ Object 



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# File 'lib/tui.rb', line 525

def cursor_column(input_field, width)
  # Calculate cursor position: prefix + cursor position in input
  @input_prefix_width + input_field.cursor + 1
end

#has_input? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tui.rb', line 516

def has_input?
  @has_input
end

#left ⇒ Object 



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# File 'lib/tui.rb', line 504

def left
  @left
end

#mark_has_input(prefix_width) ⇒ Object 



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# File 'lib/tui.rb', line 520

def mark_has_input(prefix_width)
  @has_input = true
  @input_prefix_width = prefix_width
end

#render(io, width) ⇒ Object 



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# File 'lib/tui.rb', line 530

def render(io, width)
  buffer = String.new
  buffer << "\r"
  buffer << ANSI::CLEAR_EOL  # Clear line before rendering to remove stale content

  # Set background if present
  buffer << background if background && Tui.colors_enabled?

  # Maximum content to avoid wrap (leave room for newline)
  max_content = width - 1
  content_width = [width, 1].max

  left_text = @left.to_s(width: content_width)
  center_text = @center ? @center.to_s(width: content_width) : ""
  right_text = @right ? @right.to_s(width: content_width) : ""

  # Truncate left to fit line
  left_text = Metrics.truncate(left_text, max_content) if @truncate && !left_text.empty?
  left_width = left_text.empty? ? 0 : Metrics.visible_width(left_text)

  # Truncate center text to available space (never wrap)
  unless center_text.empty?
    max_center = max_content - left_width - 4
    if max_center > 0
      center_text = Metrics.truncate(center_text, max_center)
    else
      center_text = ""
    end
  end
  center_width = center_text.empty? ? 0 : Metrics.visible_width(center_text)

  # Calculate available space for right (need at least 1 space gap after left/center)
  used_by_left_center = left_width + center_width + (center_width > 0 ? 2 : 0)
  available_for_right = max_content - used_by_left_center - 1  # -1 for mandatory gap

  # Truncate right from the LEFT if needed (show trailing portion)
  right_width = 0
  unless right_text.empty?
    right_width = Metrics.visible_width(right_text)
    if available_for_right <= 0
      right_text = ""
      right_width = 0
    elsif right_width > available_for_right
      # Skip leading characters, keep trailing portion
      right_text = Metrics.truncate_from_start(right_text, available_for_right)
      right_width = Metrics.visible_width(right_text)
    end
  end

  # Calculate positions
  center_col = center_text.empty? ? 0 : [(max_content - center_width) / 2, left_width + 1].max
  right_col = right_text.empty? ? max_content : (max_content - right_width)

  # Write left content
  buffer << left_text unless left_text.empty?
  current_pos = left_width

  # Write centered content if present
  unless center_text.empty?
    gap_to_center = center_col - current_pos
    buffer << (" " * gap_to_center) if gap_to_center > 0
    buffer << center_text
    current_pos = center_col + center_width
  end

  # Fill gap to right content (or end of line)
  fill_end = right_text.empty? ? max_content : right_col
  gap = fill_end - current_pos
  buffer << (" " * gap) if gap > 0

  # Write right content if present
  unless right_text.empty?
    buffer << right_text
    buffer << ANSI::RESET_FG
  end

  buffer << ANSI::RESET
  buffer << "\n"

  io.write(buffer)
end

#render_no_newline(io, width) ⇒ Object 



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# File 'lib/tui.rb', line 612

def render_no_newline(io, width)
  buffer = String.new
  buffer << "\r"
  buffer << ANSI::CLEAR_EOL

  buffer << background if background && Tui.colors_enabled?

  max_content = width - 1
  content_width = [width, 1].max

  left_text = @left.to_s(width: content_width)
  center_text = @center ? @center.to_s(width: content_width) : ""
  right_text = @right ? @right.to_s(width: content_width) : ""

  # Truncate left to fit line
  left_text = Metrics.truncate(left_text, max_content) if @truncate && !left_text.empty?
  left_width = left_text.empty? ? 0 : Metrics.visible_width(left_text)

  # Truncate center text to available space (never wrap)
  unless center_text.empty?
    max_center = max_content - left_width - 4
    if max_center > 0
      center_text = Metrics.truncate(center_text, max_center)
    else
      center_text = ""
    end
  end
  center_width = center_text.empty? ? 0 : Metrics.visible_width(center_text)

  # Calculate available space for right (need at least 1 space gap)
  used_by_left_center = left_width + center_width + (center_width > 0 ? 2 : 0)
  available_for_right = max_content - used_by_left_center - 1

  # Truncate right from the LEFT if needed (show trailing portion)
  right_width = 0
  unless right_text.empty?
    right_width = Metrics.visible_width(right_text)
    if available_for_right <= 0
      right_text = ""
      right_width = 0
    elsif right_width > available_for_right
      right_text = Metrics.truncate_from_start(right_text, available_for_right)
      right_width = Metrics.visible_width(right_text)
    end
  end

  # Calculate positions
  center_col = center_text.empty? ? 0 : [(max_content - center_width) / 2, left_width + 1].max
  right_col = right_text.empty? ? max_content : (max_content - right_width)

  buffer << left_text unless left_text.empty?
  current_pos = left_width

  unless center_text.empty?
    gap_to_center = center_col - current_pos
    buffer << (" " * gap_to_center) if gap_to_center > 0
    buffer << center_text
    current_pos = center_col + center_width
  end

  fill_end = right_text.empty? ? max_content : right_col
  gap = fill_end - current_pos
  buffer << (" " * gap) if gap > 0

  unless right_text.empty?
    buffer << right_text
    buffer << ANSI::RESET_FG
  end

  buffer << ANSI::RESET
  # No newline at end

  io.write(buffer)
end

#right ⇒ Object 



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# File 'lib/tui.rb', line 512

def right
  @right ||= SegmentWriter.new(z_index: 0)
end

#write ⇒ Object 



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# File 'lib/tui.rb', line 500

def write
  @left
end